The development of an image analysis system that can detect fraudulent alterations made to printed images

Jack Tchan

doi:10.1117/12.526894

3 June 2004 The development of an image analysis system that can detect fraudulent alterations made to printed images

Jack Tchan

Proceedings Volume 5310, Optical Security and Counterfeit Deterrence Techniques V; (2004) https://doi.org/10.1117/12.526894
Event: Electronic Imaging 2004, 2004, San Jose, California, United States

Abstract

An image analysis system that can differentiate between different black toners or inks non-destructively on printed text documents and images is currently under development at The London College of Printing. It is envisaged that the system will be able to find alterations in documents or images that are difficult to detect even by the most skilled expert document examiners using established forensic techniques. This paper describes the development of a nondestructive method that is intended to detect imperceptible fraudulent alterations to digital print samples. A digital image analysis system that incorporated a high-resolution low noise CCD monochrome camera with an optical system to enlarge images was used. Software that could obtain measurements of the relative optical reflectivity and sharpness characteristics of printed image areas from the raw image analysis data was developed. A single A4 sized paper sheet with a printed image that was produced using a combination of two different laser printers and an optical photocopier was illuminated using visible light. The results of subsequent image analysis measurements demonstrated it was possible to detect imperceptible alterations on the A4 sheet using this technique.

Citation Download Citation

Jack Tchan "The development of an image analysis system that can detect fraudulent alterations made to printed images", Proc. SPIE 5310, Optical Security and Counterfeit Deterrence Techniques V, (3 June 2004); https://doi.org/10.1117/12.526894

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available